You have to name your drawto destination very clearly.
So if your sending from with the client server label it Syphon_out.
Then make sure your other objects all share the same rendering context.
ALso make sure that you send the output of jit.gl.render an instruction to create a texture, make that texture go into the max syphon object.

I don’t use Resolume, but I am pretty familiar with VDMX. I am building a visual performance environment around VDMX and Max. It is pretty sweet, I can send bidirectional video between the two and process things freely. This is my syphon server patch, you may find it useful for what you are doing.

<code>

— Pasted Max Patch, click to expand. —

Copy all of the following text. Then, in Max, select New From Clipboard.